.tab button{
    background-color:#500000;
    float:left;
    border-top:solid;
    border-left:solid;
    border-right:solid;
    border-color:#500000;
    border-top-left-radius:15px;
    border-top-right-radius:15px;
    outline:0;cursor:pointer;
    padding:8px 14px;
    transition:.3s;
    font-size:17px;
    margin-right:4px;
    margin-left:4px;
    color:#fff;
    font-weight:700;
    border-width:2px
}

.tab button:hover{
    background-color:#ddd;
    color:#500000
}

.tab button.active{
    background-color:#fff;
    color: #500000;
}